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ThinkPad cannot enable the microphone in the BIOS Setup

The microphone can be disabled in the BIOS Setup (BIOS Setup -> Security -> I/O Port Access -> Microphone). The microphone will not be displayed in the Windows Device Manager after saving the BIOS Setup and rebooting the system.

However, it cannot be enabled when following the Item Specific Help of the BIOS Setup which states "To enable Microphone, select Enabled, and remove AC power. Then, fully shutdown and power on the system."

Even when the user follows this Help text, the microphone will remain disabled in the BIOS Setup and will be displayed as disabled in the Windows Device Manager.

Affected Configurations

The above symptom is associated with, but not limited to, the following systems: